Ablative & NonablativeLasersfor Face Rejuvenation  Dr. Christofer Tzermias  Dermatologist  Director  Laser Dermatology Dep...
Introduction• Laser use on the skin has become one of  the most popular methods for  achieving a younger and smoother  fac...
Laser Rejuvenation• Laser light is monochromatic, coherent and  collimated. Generates high fluence.• Reflected, Scattered,...
Depth of penetration as a function of a laser wavelength (Nelson et al 2002)Laser     Wavelength      μwater          Dept...
Ablative LASER• Thecarbon dioxide laser has long been the “gold standard” for ablative resurfacing.•Results from tradition...
Preoperative patient checklistPerform complete patient medical historyand dermatologic examinationPatient education• Video...
Preoperative patient evaluation (1/3)   Does the patient have lesions that are     amenable to laser resurfacing?   Has pr...
Preoperative patient evaluation (2/3)   Is there a history of collagen vascular disease       or immunodeficiency?   Are o...
Preoperative patient evaluation (3/3) Does the patient have realistic expectations of   the procedure? Will the patient be...
Fitzpatrick skin typesSkin type Color     Skin characteristics   I.     White     Always burns, never tans   II.    White ...
Commonly used ablative modalitiesfor skin resurfacing:spectrum from least to most aggressive      Least aggressive        ...
Glogau classification• The Glogau classification system  helps the physician determine the  deth of damage, and thus offer...
Glogau classification     Damage I (mild)Description    CharacteristicsNo wrinkles   Early photo-aging:              * Mil...
Glogau classification        Damage II (moderate)Description      Characteristicswrinkles in      Early to moderate photo-...
Glogau classification     Damage III.(advanced)Description    Characteristicswrinkles at      Advanced photo-aging:rest   ...
Glogau classification     Damage IV.(severe)Description     CharacteristicsOnly wrinkles   Severe photo-aging:            ...
Glogau classification• The patient’s goals and severity  of condition will quide the  therapeutic plan.• The potential imp...
Carbon dioxide lasers (1/2)• CO2 laser resurfacing can be performed       in the office or under anesthesia.• The waveleng...
Carbon dioxide lasers (2/2)• Advantages include excellent tissue  contractions and hemostasis.• Valuable for treating enti...
Preoperative care for CO2 laser use  Pretreatment regimen:  broad-spectrum sun-screens,  tretinoin and/or glycolic acid cr...
Postoperative care for CO2 laser useWound care:dilute acetic acid, saline, or tap water soaksevery 2-4 h followed by bland...
Erbium : yttrium-aluminum-garnet laser • Can be performed in the office or under   anesthesia. • Wavelength 2940 nm. • Tis...
Side –effects and complications of  ablative laser skin resurfacingSide-effects         Mild complicationsTransient erythe...
Side –effects and complicationsof ablative laser skin resurfacingModerate                   Severecomplications           ...
Management of adverse events   Hyperpigmentation:Continue broad-spectrum sun protection,  bleaching creams, and series or ...
Fractional ablative lasers• Fractional laser devices produce  rejuvenation and collagen remodeling    by creating thousand...
Fractional laser treatment allows toobtain remarkable results withminimal downtime.The laser energy, applied in a fraction...
Fractionated lasersFractional delivery may be superior to   traditional uniform delivery of heat for three   reasons:• Hig...
Healing Process  Shrinkage              Healing             Fractional                                 Skin Resurfacing   ...
Various CO2 lasers with fractionedemission are currently available on themarket.  Despite the fact that all these systems ...
Considerations in darker skinNonablative technologies are considered first-line    because of a lower risk of postoperativ...
Nonablative Lasers• Nonablative lasers heat the  papillary and reticular dermis,  without damaging the epidermis,     to s...
Reported indications for nonablativelasers         Photodamage         Rhytides         Pigmentary dyschromia         Lent...
Epidermical cooling devicesIceAluminum rollerCooled gelsCooled padsSapphire platePrecooled airCryogen spray
Index of nonablative devices available • Pulsed-dye lasers (PDLs) were the first   modality to be used for nonablative   r...
Fractionated nonablative lasers•   Synonym: fractional photothermolysis•   Fractionated lasers deliver energy to    vertic...
Pretreatment considerations• Nonablative technology is not a replacement  for ablative laser resurfacing• Overall appearan...
Reported indications (1/2)  Photodamage  Poikiloderma of Civatte  Rhytides  Hyperpigmentation  Lentigenes  Becker’s nevus ...
Reported indications (2/2)   Acne scarring   Atrophic scars   Hypertrophic scars   Hypopigmented scars   Surgical scars   ...
Pretreatment checklistNumber of treatments that will be requiredAmount of improvement to expect-show realistic before and ...
Pretreatment checklistStop topical medications for 2 days         before and after:• tretinoin topical• a-hydroxy acids• v...
Pretreatment checklistIf history of herpes simplex   virus,prescribe valaciclovir 500mg by   mouth twice daily for 3 days....
Selected nonablative light sources    and suggested parameters (1/8)Laser Wavelength(nm) Indications    ParametersLong-pul...
Selected nonablative light sources   and suggested parameters (2/8)Laser Wavelength(nm) Indications ParametersQ-Switched  ...
Selected nonablative light sources   and suggested parameters (3/8)Laser Wavelength(nm) Indications ParametersNd:YAG      ...
Selected nonablative light sources        and suggested parameters (4/8)Laser   Wavelength(nm) Indications     ParametersD...
Selected nonablative light sources   and suggested parameters (5/8)Laser Wavelength(nm) Indications    ParametersEr:glass ...
Selected nonablative light sources and        suggested parameters (6/8)Laser   Wavelenght(nm) Indications     ParametersF...
Selected nonablative light sources and  suggested parameters (7/8)Laser   Wavelength(nm) Indications ParametersIntense 500...
Selected nonablative light sources    and suggested parameters (8/8)Laser Wavelenght(nm) Indications ParametersLED     Pre...
Patients should be reminded• The maximum collagen  remodeling occurs 30-90 days  after• May like the immediate post  look ...
Adverse events associated        with nonablative lasers (1/3)Adverse event      CommentsPain               Depends on dev...
Adverse events associated with  nonablative lasers (2/3)Adverse event         CommentsPurpura       Most Commonly occurs w...
Adverse events associated with   nonablative lasers (3/3)Adverse event          CommentsInfection        Query patient as ...
ConclusionWith any ablative modality, treatment must be  pursued cautiously and with specific  precautions against scarrin...
Acknowledgments• Sonia Batra, MD, USC, LA, CA• Tina Bhutani, BSc, USC, LA,CA• Joy Kunishige, MD, UTHSC, Houston,  TX• Paul...
Mechanism of action•     Acute Thermal Damage Phase (48-72 hours)             –   Oedema             –   Release of chemic...
Upcoming SlideShare
Loading in …5
×

Ablative & Nonablative Lasers for Face Rejuvenation

2,726
-1

Published on

Ablative & Nonablative Lasers for Face Rejuvenation

  1. 1. Ablative & NonablativeLasersfor Face Rejuvenation Dr. Christofer Tzermias Dermatologist Director Laser Dermatology Dept Athens Medical Center Greece
  2. 2. Introduction• Laser use on the skin has become one of the most popular methods for achieving a younger and smoother facial appearance• Unfortunately, the increasingly widespread availability of cosmetic laser therapy coupled with attendant publicity has created extraordinary, often unrealistic expectations.• Proper patient selection and assessment of each individual’s skin is crucial prior to determining whether an ablative procedure is indicated.
  3. 3. Laser Rejuvenation• Laser light is monochromatic, coherent and collimated. Generates high fluence.• Reflected, Scattered, Transmitted, Absorbed• Absorbed energy – Thermal energy Clinical effect & collateral damage• 1956 – Maiman – Continuous output• 1985 – Selective Photothermolysis• Ultrashort pulses of high energy Ablate or do not ablate the epidermis Dermal wounding Thermal effect: significant or minimal
  4. 4. Depth of penetration as a function of a laser wavelength (Nelson et al 2002)Laser Wavelength μwater Depth of (nm) (per mm) penetration (μm)Diode 980 0.0448 32000Nd:YAG 1064 0.0177 81100Nd:YAG 1320 0.204 7000Diode 1450 3.04 470Er.glass 1540 1.18 1200Er:YAG 2940 1220 1.20CO2 10600 84.40 17 μwater :absorption coefficient
  5. 5. Ablative LASER• Thecarbon dioxide laser has long been the “gold standard” for ablative resurfacing.•Results from traditional CO2 systems have beendramatic for severe photo-damage and scarring, butpatients need to be aware of associated downtimerequirements and the risk of pigmentation alterationin darker skin types.• Newer technologies, including erbium : yttrium-aluminum-garnet (Er: YAG) systems and fractionallasers, can treat a variety of cutaneous disorderswhile offering shorter recovery times and improvedsafety in a broader spectrum of skin types.
  6. 6. Preoperative patient checklistPerform complete patient medical historyand dermatologic examinationPatient education• Video demonstration• Review brochure• Show representative photographs• Provide information sheet• Take preoperative patient photographsBegin preoperative skin care regimenObtain informed consent for procedure
  7. 7. Preoperative patient evaluation (1/3) Does the patient have lesions that are amenable to laser resurfacing? Has previous treatment been received for the condition? Is the patient taking isotretinoin or immunosuppressive medication? What is the patient’s skin type? Does the patient have a history of cold sores?
  8. 8. Preoperative patient evaluation (2/3) Is there a history of collagen vascular disease or immunodeficiency? Are other dermatologic conditions present that could spread after treatment? Is the patient prone to acne breakouts? Does the patient have a tendency to form hypertrophic scars or keloids
  9. 9. Preoperative patient evaluation (3/3) Does the patient have realistic expectations of the procedure? Will the patient be compliant with all preoperative and postoperative instructions? Are there medical conditions that would interfere with using intravenous anesthesia?
  10. 10. Fitzpatrick skin typesSkin type Color Skin characteristics I. White Always burns, never tans II. White Usually burns, tans less than average III. White Sometimes mild burn, tans about average IV. White Rarely burns, tans more than average V. Brown Rarely burns, tans profusely VI. Black Never burns, deeply
  11. 11. Commonly used ablative modalitiesfor skin resurfacing:spectrum from least to most aggressive Least aggressive Microdermabrasion Superficial chemical peel Medium-depth chemical peel Deep chemical peel Fractional lasers Er: Yag laser CO2 lasers Most aggressive (greatest depth of ablation)
  12. 12. Glogau classification• The Glogau classification system helps the physician determine the deth of damage, and thus offers some indication of what the depth of resurfacing should be.• Patients with minimal photo-damage may require ablation of only the upper part of the epidermis.• Those with moderate photo-damage may require more extensive resurfacing to the level of the papillary dermis, and so on.
  13. 13. Glogau classification Damage I (mild)Description CharacteristicsNo wrinkles Early photo-aging: * Mild pigmentary changes * No keratoses * Minimal wrinkles * Patient age: 20s to 30s * Minimal or no make up * Minimal acne scarring
  14. 14. Glogau classification Damage II (moderate)Description Characteristicswrinkles in Early to moderate photo-motion aging: * Early senile lentigines * Keratoses palpable but not visible * Parallel smile lines beginning to appear * Patient age : 30s to 40s * Some foundation make-up worn * Mild acne scarring
  15. 15. Glogau classification Damage III.(advanced)Description Characteristicswrinkles at Advanced photo-aging:rest * Obvious dyschromias and telangiectasia * Visible keratoses * Static wrinkles present * Patient age : older than 50years * Heavy foundation usually worn * Acne scarring : make-up cannot cover
  16. 16. Glogau classification Damage IV.(severe)Description CharacteristicsOnly wrinkles Severe photo-aging: * Yellow-gray skin color * Prior skin malignancies * Wrinkles throughout- no normal skin * Patient age :60s or 70s * Make-up cannot be worn – it cakes and cracks * Severe acne scarring
  17. 17. Glogau classification• The patient’s goals and severity of condition will quide the therapeutic plan.• The potential improvement in texture afforded by this technique must be weighed against the greater potential for pigmentary alteration and/or scarring.
  18. 18. Carbon dioxide lasers (1/2)• CO2 laser resurfacing can be performed in the office or under anesthesia.• The wavelength 10,600nm.• Depth of tissue ablated per pass is approximately 20-30μm.• Thermal damage produced is 30-100 μm.• Time to re-epithelialization is 7-10days.• Duration of post-laser erythema is 3-6 months.• Significant collagen shrinkage and remodeling requires at least two passes.• A greater number of passes or excess energy densities results in an increased risk of scarring.• CO2 systems in pulsed or scanning modes deliver predictable ablation levels and consistent results.
  19. 19. Carbon dioxide lasers (2/2)• Advantages include excellent tissue contractions and hemostasis.• Valuable for treating entire cosmetic subunits, focal lesions, or full-face resurfacing.• Indications include moderate to severe rhytides and photo-damage, scarring, actinic keratosis, and other superficial lesions.• In darker skin types, more conservative settings and fewer passes can decrease the risk of scarring and pigment alteration.• Laser “test spots” in inconspicuous areas can be performed in patients at high risk of dyschromia.
  20. 20. Preoperative care for CO2 laser use Pretreatment regimen: broad-spectrum sun-screens, tretinoin and/or glycolic acid creams, prophylactic oral antibiotics, and antiviral medications. Topical lightening agents: hydroquinone, kojic acid, soy, azelaic acid, and others can also be used to reduce postinflammatory hyperpigmentation. Anxious patients: oral benzodiazepines such as diazepam (5-10 mg) can be given half an hour before the procedure.
  21. 21. Postoperative care for CO2 laser useWound care:dilute acetic acid, saline, or tap water soaksevery 2-4 h followed by bland emollientsare essential for proper healingMedications :continuation of oral antibiotics and antiviral drugs;short-term pain medications including narcoticsshould be given in necessaryFollow-up:post-laser follow-up in the office at 2-5 days isvaluable to note the quality of the patient’swound care and the progress of wound healing.
  22. 22. Erbium : yttrium-aluminum-garnet laser • Can be performed in the office or under anesthesia. • Wavelength 2940 nm. • Tissue ablated per pass approximately 2-3 μm. • Thermal damage produced 5-30 μm. • Time to re-epithelialization 4-5 days. • Duration of post-laser erythema 3-4 weeks. • Er: YAG produces less thermal damage than the CO2 laser-multiple passes are needed to ablate to an equivalent level. • Indicatiοns are mild to moderate rhytides and photo-damage, mild to moderate scarring, and superficial lesions. • Can be a good option in patients with darker skin types.
  23. 23. Side –effects and complications of ablative laser skin resurfacingSide-effects Mild complicationsTransient erythema Prolonged erythemaLocalized edema MiliaPruritus Acne Contact dermatitis
  24. 24. Side –effects and complicationsof ablative laser skin resurfacingModerate Severecomplications complicationsPigmentary change Hypertrophic scarInfections Ectropion(bacterial,fungal,viral)
  25. 25. Management of adverse events Hyperpigmentation:Continue broad-spectrum sun protection, bleaching creams, and series or superficial peels Infection:Be guided by culture and sensitivity Scarring:Aggressive treatment will lead to resolution.Topical steroid creams with intralesional steroidsif hypertrophic scars, series of pulsed dye lasertreatments, silicone sheeting, or topical gels.Arrange frequent gratis follow-up visits in your office
  26. 26. Fractional ablative lasers• Fractional laser devices produce rejuvenation and collagen remodeling by creating thousands of microscopic wounds called microscopic treatment zones (MTZs) with sparing of adjacent skin.• Indications include mild to moderate rhytides and photo-damage, acne scars, pigmented lesions, and actinic keratoses.
  27. 27. Fractional laser treatment allows toobtain remarkable results withminimal downtime.The laser energy, applied in a fractional way,creates very thin and spaced columns of thermaldamage which penetrate deep into the dermalskin layer and stimulate a new collagenproduction. The tissuebetween the columnsof thermal damage isspared, resulting ina faster healing process.
  28. 28. Fractionated lasersFractional delivery may be superior to traditional uniform delivery of heat for three reasons:• Higher irradiation within the columns results in more damage and increased wound healing response. This can be achieved without increasing the power of the optical source.• Faster healing response due to increased surface-to- volume ratio of the microwounds. The interface between injured and normal skin, where most neocollagen formation occures, is maximized.• Larger safety margin as fractional resurfacing is less likely to result in infections and scarring.
  29. 29. Healing Process Shrinkage Healing Fractional Skin Resurfacing Erythema time1dd 2dd 4-7dd Shrinkage Traditional Skin Resurfacing Healing Erythema time1dd 2dd 8-10dd 40gg – 3 months
  30. 30. Various CO2 lasers with fractionedemission are currently available on themarket. Despite the fact that all these systems are based on the same principles, they present significant differences with regard to output power, dwell-time, distance between the dots, varying scanner shapes and the laser beam profile. These differences may produce clinical results that differ greatly between one device and another.
  31. 31. Considerations in darker skinNonablative technologies are considered first-line because of a lower risk of postoperative complications.However, ablative therapies (combination treatment with CO2 and erbium lasers, single-pass CO2 laser, or long-pulsed Er :YAG systems) can be used in a conservative fashion to treat advanced damage and scarring.Pre-and post-procedural sun protection and bleaching creams can minimize the risk of postinflammatory hyperpigmentation.In the post-laser period, short-them use of a medium potency steroid cream may also reduce the hyperpigmentation risk.If postinflammatory hyperpigmentation develops, glycolic acid peels and microdermabrasion can hasten resolution.
  32. 32. Nonablative Lasers• Nonablative lasers heat the papillary and reticular dermis, without damaging the epidermis, to stimulate collagen synthesis.• Synonyms include nonablative remodeling.• Applications include photo-aging, acne, and acne scars.• Compared with ablative procedures, nonablative resurfacing provides more modest improvements, but with essentially no downtime and an excellent safety profile.
  33. 33. Reported indications for nonablativelasers Photodamage Rhytides Pigmentary dyschromia Lentigenes Melasma Telangiectasia Erythema Acne Acne scarring Atrophic scars Hypertrophic scars Surgical scars Hair removal
  34. 34. Epidermical cooling devicesIceAluminum rollerCooled gelsCooled padsSapphire platePrecooled airCryogen spray
  35. 35. Index of nonablative devices available • Pulsed-dye lasers (PDLs) were the first modality to be used for nonablative remodeling and show to improve acne vulgaris. • Neodymium: yttrium-aluminum-garnet (Nd:YAG) lasers benefit rhytides and acne scarring. • 1450-nm diode is effective for rhytides, acne, and acne scarring, but is associated with some pain. • 1540-nm erbium: glass may be used for rhytides or acne. • Fractionated erbium lasers are nonablative with a growing list of applications.
  36. 36. Fractionated nonablative lasers• Synonym: fractional photothermolysis• Fractionated lasers deliver energy to vertical columns of skin to create microscopic treatment zones (MTZs)• Inter-MTZ skin remains untreated and serves as a reservoir of healthy skin to speed healing• Multiple passes and treatment sessions are needed to treat a given area completely• Results are probably somewhere between that of nonablative and ablative laser therapy, although efficacy differs widely from patient to patient
  37. 37. Pretreatment considerations• Nonablative technology is not a replacement for ablative laser resurfacing• Overall appearance of the skin will be improved, because lines and textural differences will be softened, but not eradicated• Skin changes are usually subtle and gradual• A number of treatments is required, over a period of months before the full benefits can be appreciated• A total of 3-6 sessions is usually required, at 3- 4 week intervals
  38. 38. Reported indications (1/2) Photodamage Poikiloderma of Civatte Rhytides Hyperpigmentation Lentigenes Becker’s nevus Melasma Telangiectasia Erythema Acne
  39. 39. Reported indications (2/2) Acne scarring Atrophic scars Hypertrophic scars Hypopigmented scars Surgical scars Striae distensae Actinic keratosis Disseminated superficial actinic porokeratosis
  40. 40. Pretreatment checklistNumber of treatments that will be requiredAmount of improvement to expect-show realistic before and after picturesAvoid certain medications for 1 week before and after certain laser procedures:• Aspirin• Ibuprofen• Vitamin E• Anti-inflammatory medications• Photosensitizing medications
  41. 41. Pretreatment checklistStop topical medications for 2 days before and after:• tretinoin topical• a-hydroxy acids• vitamin C derivativesConfirm no contraindications for laser treatment:• pregnancy• history of keloids• current suntan• isotretinoin therapy within 6 months• lupus erythematosus or other photosensitivity
  42. 42. Pretreatment checklistIf history of herpes simplex virus,prescribe valaciclovir 500mg by mouth twice daily for 3 days. Start 1 day before procedureIf petreatment anesthesia needed, prescribe topical anesthetic such as EMLA cream to treatment area 1 h before treatment under plastic wrap occlusion.Pretreatment photos in a reproducible position and lightingEye protection for patient and physicianTeeth protection for patient
  43. 43. Selected nonablative light sources and suggested parameters (1/8)Laser Wavelength(nm) Indications ParametersLong-pulsed 595 Photo-damage; 7-8.5 j/cm2,PDL(V-beam, acne vulgaris 6-20 ms.Candela) 10-mm spotNd: YAG 1064 Photo-damage 3.5 j/cm2,(Gentle YAG; 6-mm spotCandela) (28 ns pulse duration is standard)
  44. 44. Selected nonablative light sources and suggested parameters (2/8)Laser Wavelength(nm) Indications ParametersQ-Switched 1064 Acne scars 3-4 j/cm2Nd: YAG 4-6 ns puls du,(Medlite rep. rate 10Hz,IV; Continuum) 6-mm spot Deliver overlapping pulses until mild to moderate erythema achieved
  45. 45. Selected nonablative light sources and suggested parameters (3/8)Laser Wavelength(nm) Indications ParametersNd:YAG 1064 photo-damage; Energy(CoolTouch II; acne scarring 12-16 j/cm2,ICN DCDPharmaceuticals) before during and after
  46. 46. Selected nonablative light sources and suggested parameters (4/8)Laser Wavelength(nm) Indications ParametersDiode(Smooth 1450 Photo-damage 12-14 J/cm2Beam, ICN acne and acne 6mm spotPhotonics) scarring DCD before, during and after
  47. 47. Selected nonablative light sources and suggested parameters (5/8)Laser Wavelength(nm) Indications ParametersEr:glass 1,540 Photo-damage 3 pulses(Aramis per shot,-Quantel 10J per pulseLaser; Quantel fluenceMedical, 30J/cm2, 4-mm spot, slightlyFrance) ovelrapping pulses, no visible changes occur
  48. 48. Selected nonablative light sources and suggested parameters (6/8)Laser Wavelenght(nm) Indications ParametersFractional 1500 Photo-damage Treatmentlaser (Fraxel acne and acne level 8-11re:store Reliant scarring to obtain23-32%Technologies) coverage, energy level 50-70mJ, approximately 8 passes to deliver total of 3-4kJ
  49. 49. Selected nonablative light sources and suggested parameters (7/8)Laser Wavelength(nm) Indications ParametersIntense 500-1200 Photo-damage, 560nmPulsed light including filter,fluence(Lumenis One, poikiloderma 16-18J/cm2 Lumenis of Civatte;acne with thinSanta Clara,CA) layer of gel. Double pulse with3- 4ms pulse duration and delay of 10ms. Parameters may vary for other systems
  50. 50. Selected nonablative light sources and suggested parameters (8/8)Laser Wavelenght(nm) Indications ParametersLED Preodominantly Periorbital Total output(Gentle 590 thytides of 0.1 j/cm2Waves, per treatmentVirginia has beenBeach, reportedVA)
  51. 51. Patients should be reminded• The maximum collagen remodeling occurs 30-90 days after• May like the immediate post look (attributable mainly to edema). But this end-result is possible after multiple treatments• Maintenance therapy can be performed 3-4 times per year
  52. 52. Adverse events associated with nonablative lasers (1/3)Adverse event CommentsPain Depends on device, more so with deep- infrared devices that target waterErythema Usually clears in hours, but can last several days. This is expected endpoint with Fraxel re: storeEdema Usually clears within 24h. May last longer with Fraxel re: store
  53. 53. Adverse events associated with nonablative lasers (2/3)Adverse event CommentsPurpura Most Commonly occurs with PDL. Transient purpura may be obtained when treating telangiestacia. For acne and photo-aging lower fluence or lengthen pulse durationCrusting Indicates too much epidermal heatingBlistering Indicates too much epidermal heating: may result in scarring
  54. 54. Adverse events associated with nonablative lasers (3/3)Adverse event CommentsInfection Query patient as to history of prior HSV infection. Consider Staphylococcus aureus infection if epidermis is inadvertently ablatedDyspigmentation Most common in darker skin types. Correct amount of epidermal cooling should be used.Textural scarring Rare
  55. 55. ConclusionWith any ablative modality, treatment must be pursued cautiously and with specific precautions against scarring and pigmentary alteration.Nonablative lasers are the result of technology meeting patient demands for “Iunchtime” treatments. Nonablative resurfacing is relatively new and, although results may be mild and sometimes inconsistent, new developments and protocols will improve efficacy, with an outstanding safety profile.
  56. 56. Acknowledgments• Sonia Batra, MD, USC, LA, CA• Tina Bhutani, BSc, USC, LA,CA• Joy Kunishige, MD, UTHSC, Houston, TX• Paul Friedman, MD, UTHSC, Houston, TXAdapted from Cosmetic Dermatology (Elsevier 2009)Murad Alam, MD, Chicago, ILHayes Gladstone, MD, Stanford, CARebecca Tung, MD, Cleveland, OH
  57. 57. Mechanism of action• Acute Thermal Damage Phase (48-72 hours) – Oedema – Release of chemical mediators – Collagen Shrinkage – Proliferation Phase (30 days) – Fibroblastic Recruiting – New dermal matrix molecules – New collagen fibres – Remodelling Phase – Extinction of Inflammatory Infiltration – Matured Collagen fibres – Increase of Collagen Fibre Strain – New Elastic fibres
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×